body 
{
   background-image:url('images/wallpaper.png');
}
.header
{
  border-style: dotted;
  border-size: 3px;
}

/*toate elementele p din clasa header*/
.header p
{
   text-align:center;
   font-size: 30px;
}

.main
{
   margin-top: 25px;
}

table, td, th
{
  border:1px solid green;
}

th
{
  background-color:green;
  color:white;
}  